Submission #427230

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
427230	2021-06-14 13:30:42	keko37	The Xana coup (BOI21_xanadu)	C++14	100 / 100	149 ms	24340 KiB

xanadu

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#include<bits/stdc++.h>
using namespace std;
typedef long long llint;
typedef pair <int, int> pi;
const int MAXN = 100005;
int n;
llint dp[MAXN][2][2], par[MAXN], col[MAXN];
vector <int> v[MAXN];
void dfs (int x, int rod) {
    par[x] = rod;
    for (auto sus : v[x]) {
        if (sus != rod) dfs(sus, x);
    }
}
llint calc (int x, int f, int p) {
    if (dp[x][f][p] != -1) return dp[x][f][p];
    llint res = 1e9;
    llint sum = 0, br = 0, mn = 1e9;
    for (auto sus : v[x]) {
        if (sus == par[x]) continue;
        llint a = calc(sus, 0, f);
        llint b = calc(sus, 1, f);
        sum += min(a, b);
        if (b <= a) br ^= 1;
 
 
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Compilation message (stderr)

xanadu.cpp: In function 'llint calc(int, int, int)':
xanadu.cpp:33:12: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
   33 |     if (br != f ^ p ^ col[x]) res = sum + mn; else res = sum;
      |         ~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 40 / 40
• Subtask 5: 30 / 30